A variable curvature screw pile driver drill bit

Abstract

The invention provides a drill bit of a variable-curvature screw pile driver. The drill bit comprises a drill stem, a drill point, a screw blade and a drill pick; the curved surfaces of the two sides of the drill pick are an inner soil contacting curved surface and an outer soil contacting curved surface, respectively; the profile curve of the inner soil contacting curved surface of the longitudinal section of the drill pick and the profile curve of the outer soil contacting curved surface of the same conform to different equations, respectively; the drill point is composed of three drill point base bodies which are symmetrical to each other about the center of circle of an end face, going into soil, of the drill stem. The drill bit of the variable-curvature screw pile driver has the advantages that the equation curves adopted by the drill bit are optimized based on tests, the bionic curves applied to the inner and outer soil contacting curved surfaces are derived from cock toe soil contacting curved surfaces, the inner and outer soil contacting profile curves of the cock toes have excellent soil resistance reduction and desorption capability, and once the structures are applied to the drill pick part of the drill bit of the pile driver, the pile driver is enabled to have excellent soil excavation capability, and meanwhile, the soil resistance to the drill bit is also reduced, and therefore, the service life of the drill bit can be prolonged and the working efficiency of the drill bit can be improved.

Description

technical field [0001] The invention relates to the field of rock-breaking tools for drilling equipment, in particular to a variable-curvature screw pile driver drill bit. Background technique [0002] As a common construction machine, the screw pile driver has important applications in bridges, roadbeds and tunnels. At present, the drill bits commonly used in engineering construction are composed of drill pipe, drill tip, drill pick and helical guide vane. The helical blade is fixed on the drill pipe, and the drill tip and drill pick are welded to the head of the drill pipe. One, the drill pipe is a hollow structure. The piling drill bit with this structure has the following problems: 1. The drill tip and the drill pick are severely worn during the piling process; 2. The screw blade clay problem is serious during the piling process; 3. The force structure of the drill tip is not reasonable. The above problems in the piling process will seriously affect the piling efficien...

AI Technical Summary

Problems solved by technology

[0003] Since the problems existing in the piling process of the piling machine drill bit are not only related to the material and structure of the drill bit, but also related to the geometry of the drill bit surface in sliding contact with the soil, the purpose of this invention is to solve the unreasonable structure of the existing drill bit, serious clay and long life Short question, redesign the shape of the drill bit to provide a variable curvature helical pile driver bit

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